I believe after win 10 update 3180 will not print 2-sided. Used recovery to revert back to before update. Also uninstalled and reinstalled full brother driver package. Also checked 3180 utilities for proper 2-sided setting and also the PC 3180 driver software. Everything is checked for 2-sided. If I print 4 pages the PC says it will use 2 sheets but it actually uses 4 single sided pages.